Accumulation of blood within a tissue.

Hematoma(TOPNOTCH)Robbins Basic Pathology, 8th ed. p.86

1-2mm hemorrhages into skin, mucous membranes, or serosal surfaces.

Petechiae(TOPNOTCH)Robbins Basic Pathology, 8th ed. p.86

3-5mm hemorrhages which can occur with trauma, vascular inflammation, or increased vascular fragility.

Purpura(TOPNOTCH)Robbins Basic Pathology, 8th ed. p.86

28

1-2cm subcutaneous hematomas/bruises.

Ecchymoses (TOPNOTCH)Robbins Basic Pathology, 8th ed. p.86

29

It is a consequence of tightly regulated processes that maintain blood in a fluid, clot-free state in normal vessels while inducing the rapid formation of a localized hemostatic plug at the site of vascular injury.

Normal hemostasis(TOPNOTCH)Robbins Basic Pathology, 8th ed. p.86

30

Pathologic form of hemostasis.

Thrombosis(TOPNOTCH)Robbins Basic Pathology, 8th ed. p.86

31

It occurs after an initial injury, as a result of reflex neurogenic mechanisms.